SUMMARY
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I have lots of open libreoffice windows. I sort them on the task bar with drag and drop. When I open another program and lack of space forces the libreoffice windows to get grouped, the resulting textlist of windows has a different order.  When the group gets ungrouped again the window order stays as it is.
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STEPS TO REPRODUCE
1. Set grouping to "by program name" (i'm translating from german, so text might be slightly different)
2. Open lots of windows from same app but not enough to trigger grouping.
3. Sort windows with drag and drop.
4. Set on-click behavior of groups to "show textlist"
5. Open other program so that grouping is triggered.
6. Click group.
7. Observer order of windows has changed inside the group.
8. Close the other program again.
9. Observe that window order stays changed and you have to sort them again manually.

OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION